Modify the Message Box(Yes or No box) of PO deletion

I want to modify the below message box(Refer Screen shot) which will be displayed when you delete the PO(Status -Open Order).The message box is working based on the command in command-button 'Delete'(Delete record). I want to modify the text in that message box.Please tell me the possibilities...?

This message is handled by the kernel. The super() in validatedelete on the form data source will trigger this confirmation message. You can enable/disable the confirm delete message from Tools -> options -> Confirmation (specific to user), but i don't think you can modify this message.